# Cosmos · Chromia versus other blockchain platforms · Learn Chromia > This lesson starts with a short overview of Cosmos, then compares it with Chromia and weighs the strengths and weaknesses of each platform. Source: https://chromia.com/learn/chromia-comparisons/cosmos/ Chromia versus other blockchain platformsLesson 4 of 6 1. [01Chromia versus other blockchain platforms](https://chromia.com/learn/chromia-comparisons/overview/) 2. [02Polkadot](https://chromia.com/learn/chromia-comparisons/polkadot/) 3. [03Solana](https://chromia.com/learn/chromia-comparisons/solana/) 4. [04Cosmos](https://chromia.com/learn/chromia-comparisons/cosmos/) 5. [05Ethereum](https://chromia.com/learn/chromia-comparisons/etherum/) 6. [06Polygon](https://chromia.com/learn/chromia-comparisons/polygon/) [Learn](https://chromia.com/learn/)[Chromia versus other blockchain platforms](https://chromia.com/learn/chromia-comparisons/) 04 / 06 # Cosmos This lesson starts with a short overview of Cosmos, then compares it with Chromia and weighs the strengths and weaknesses of each platform. ## Cosmos **Tech and Architecture** * Cosmos is a **network of independent blockchains**. Each chain is called a zone, and zones link to one another through the Cosmos Hub. * Consensus runs on Tendermint (now maintained as CometBFT), a **Proof-of-Stake (PoS)** mechanism in which a validator's selection depends on how much stake it holds. * Its best-known feature is the **Inter-Blockchain Communication (IBC) protocol**, which lets separate blockchains move tokens and other data between each other. **Scalability** * Cosmos scales through a modular design of Hubs and Zones. Every zone runs on its own and processes transactions at the same time as other zones. * As a result, the network can handle more transactions than a blockchain built as a single chain. **Development Tools** * The **Cosmos SDK** is a framework that makes building blockchains simpler. You can assemble a chain from ready-made modules or write your own. * Cosmos is written in Go, and the Cosmos SDK mainly targets Go. Smart contracts can also be written in other languages, such as Solidity or Rust. **Fee Structure** * Fees in Cosmos are dynamic: they depend on how busy the network is and how complex a transaction is. ## Comparison ### Development --- Cosmos * Development centers on the Cosmos SDK, a Go-based framework for building blockchain applications. Its prebuilt components make custom blockchains easier to create. * You can work in several languages, including Go, Rust, and Solidity. * Ignite CLI (formerly Starport) is an interface for building and launching Cosmos blockchains, with tooling for scaffolding, testing, and deployment. Chromia * On Chromia you write code in Rell, a relational language for blockchain programming. Rell can be easier to pick up than Go or Rust, which lowers the barrier to building dapps on Chromia. * Writing Rell on Chromia feels much like Web2 development. See the [Rell language documentation](https://docs.chromia.com/rell/rell-intro/) for details. * Chromia ships tools and libraries that handle authentication, transaction signing, and asset management, and keeps adding features aimed at fast dapp development. * The development environment includes Chromia's own test framework and developer-friendly tools that keep deployment simple. ### Scalability --- Cosmos * Cosmos gets its scalability from a design built on zones and hubs. + A zone is a standalone blockchain. It can define its own governance and consensus mechanism and be customized for a particular use case. + A hub is a blockchain that links zones together. The Cosmos Hub was the first hub and remains the main one in the network. * Blockchains use the IBC protocol to communicate and exchange value and data with each other. * Because each zone processes its own transactions, the network executes transactions in parallel. You can optimize a zone for a specific task or application to improve its performance and efficiency. Chromia * On Chromia, each dapp runs on its own subchain, and a single subchain handles roughly 500 transactions per second. When a dapp grows, you scale it by adding more chains. This keeps throughput high and makes scaling predictable, similar to working in a conventional cloud environment. Subchains are isolated from one another, so transactions run in parallel. In other words, you scale horizontally, and the limit on scalability is set only by how you design your app. The subchain architecture is part of the platform itself, so adopting it takes little effort on your part. ### Operational Costs & Fees --- Cosmos * Cosmos measures resource consumption during execution with a dedicated unit called gas, which works like a conventional gas or transaction fee. Reads from and writes to the blockchain usually consume gas, and so can costly computations. * Users can pick, within limits, how much fee to pay, and this can affect how quickly or with what priority their transaction is processed. Either way, the end user pays for every action on the Cosmos network. Chromia * Chromia takes a different approach: you host your decentralized app (dapp) in a container for a fixed, predictable fee. You know your monthly operating costs up front and can design your own end-user fee structure to cover them. Rather than paying gas for each action, you deal with one cost that is easier to manage. * When usage of your dapp increases, you can give its container more resources, much as you would scale resources in a cloud environment. ### Revenue Models --- Cosmos * Operations on the Cosmos network are paid for with transaction fees. If you build a dapp on Cosmos, you can earn income by adding your own fees on top of transactions. * Validators earn rewards by staking and helping secure the network. Chromia * Chromia keeps dapp operating costs fixed and predictable, and you decide which fee model applies to your end users. You are not tied to transaction-based gas fees. * You might charge a monthly subscription, bill for individual features, or charge per transaction if that suits you. This makes for a friendlier user experience: users can start for free, and you begin earning once they see the value of your dapp. Traditional web apps work this way, and Web3 apps can too. ### Conclusion and Comparison Summary to Chromia --- Cosmos and Chromia take distinct approaches to building blockchain platforms. The sections below summarize the strengths and weaknesses of each. ### Architecture Cosmos connects many blockchains through its hub-and-zone model. The Cosmos SDK supplies tools and modules that make it simpler to build secure, scalable chains. Zones are independent, but because they connect through the Cosmos Hub, they depend on it to some degree, and that dependency could become a point of failure. Chromia emphasizes simplicity through the Rell language, broad library and tool support, and its subchain architecture. Developers coming from traditional backgrounds can therefore move into blockchain development without a steep learning curve. ### Scalability Considerations Cosmos scales through independent zones that process transactions concurrently and communicate efficiently over the IBC protocol. You can specialize a Cosmos zone by adapting its functionality and governance model to a particular use case or industry. A zone optimized this way runs more efficiently for the applications it targets. Chromia follows a comparable idea with a simpler scaling story. Every dapp gets its own subchain that can handle high transaction volumes, and you add subchains as demand grows, so the system scales well. You manage scale by adjusting resources, much like with cloud services, which keeps development and resource management simple. Adding subchains lets transactions run in parallel and puts scaling fully under your control. ### Operational Costs & Fees The Cosmos gas model can make costs unpredictable for both developers and end users. Every transaction carries a fee, which restricts the revenue models and user experiences you can offer. A freemium model, for instance, is hard to build when users always pay a transaction fee. Chromia instead charges a fixed, predictable fee to host a dapp. Budgeting becomes simpler, and you are free to design your own end-user fee structure, which leads to a better user experience. ### Revenue Models Cosmos relies on standard blockchain revenue sources such as staking and transaction fees. These work, but they may be less flexible than some developers want. Chromia lets you pick your revenue model, whether subscriptions, per-feature pricing, or per-transaction fees. That freedom supports revenue strategies closer to those of modern web apps. ### Final Words Cosmos offers a powerful, scalable, and flexible blockchain ecosystem. Chromia stands apart through its approachable development experience, predictable costs, and flexible revenue options. Those qualities make Chromia especially attractive if you want an easy way into blockchain development. Written for this site from Chromia’s public course. Code samples are the course’s own. [← Previous**Solana**](https://chromia.com/learn/chromia-comparisons/solana/)[Next →**Ethereum**](https://chromia.com/learn/chromia-comparisons/etherum/) On this page * [Cosmos](#cosmos-1) * [Comparison](#comparison)